/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.mongodb.client.unified;

import org.bson.BsonValue;

final class OperationResult {

    public static final OperationResult NONE = new OperationResult();

    private final BsonValue result;
    private final Exception exception;

    static OperationResult of(final BsonValue result) {
        return new OperationResult(result);
    }

    static OperationResult of(final Exception exception) {
        return new OperationResult(exception);
    }

    private OperationResult() {
        result = null;
        exception = null;
    }

    private OperationResult(final BsonValue result) {
        this.result = result;
        this.exception = null;
    }

    private OperationResult(final Exception exception) {
        this.result = null;
        this.exception = exception;
    }

    public BsonValue getResult() {
        return result;
    }

    public Exception getException() {
        return exception;
    }

    @Override
    public String toString() {
        if (result != null) {
            return result.toString();
        } else if (exception != null) {
            return exception.toString();
        } else {
            return "<No Result>";
        }
    }
}
